US8619520B2 - Lens driving unit for optical pickup and optical disc drive including the lens driving unit - Google Patents
Lens driving unit for optical pickup and optical disc drive including the lens driving unit Download PDFInfo
- Publication number
- US8619520B2 US8619520B2 US13/564,780 US201213564780A US8619520B2 US 8619520 B2 US8619520 B2 US 8619520B2 US 201213564780 A US201213564780 A US 201213564780A US 8619520 B2 US8619520 B2 US 8619520B2
- Authority
- US
- United States
- Prior art keywords
- lens
- driving
- coils
- lens frame
- driving coils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active - Reinstated
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0935—Details of the moving parts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
Definitions
- the following description relates to a lens driving unit for an optical pickup, and more particularly, to a magnetic circuit of an actuator of a lens driving unit.
- a typical object lens driving unit of an optical pickup has a voice coil motor (VCM).
- VCM voice coil motor
- the object lens driving unit has a static structure, including a permanent magnet and a yoke, and has a moving structure, including a driving coil and an object lens.
- the moving structure is supported by a plurality of suspension wires.
- the suspension wires have an electrical connection function for applying a driving voltage to a driving coil to control focusing and tracking of a lens.
- an optical pickup for a slim-type optical disc drive that is used for a notebook computer needs to have a limited thickness.
- the limit on thickness leads to a limit on the amount of weight and parts that can be used for the optical pickup.
- the optical pickup typically has a low strength.
- the optical pickup for a slim-type optical disc drive may be formed of light material because a higher driving current is required as a weight of a lens frame is increased.
- an optical pickup is formed of a light plastic.
- a lens frame formed of a light plastic is structurally unsound and may warp easily due to concentrated electromagnetic force and tracking electromagnetic force applied diagonally to the lens frame.
- the warpage of the lens frame may result in malfunction such as tracking and focusing delays.
- a lens driving unit including a lens frame comprising four side surfaces and an object lens that is disposed on a top surface of the lens frame, a pair of first driving coils that are wound around a first side surface of the lens frame, a pair of second driving coils that are wound around a third side surface facing the first side surface of the lens frame, a plurality of suspension wires which are electrically connected to the pair of first driving coils and the pair of second driving coils, a yoke comprising a plurality of magnets fixed thereto which correspond to the first and second driving coils, and a wire holder to which one side of the yoke and to which the suspension wires are fixed.
- the lens driving unit may further comprise a coil winding unit in which the pair of first driving coils and the pair of second driving coils are wound around the first and third side surfaces.
- the coil winding unit may be integrally formed in the lens frame.
- the pair of first driving coils and the pair of second driving coils may be a tracking coil and a focusing coil, respectively.
- the first and third side surfaces of the lens frame may have relatively large widths in comparison to the second and fourth side surfaces.
- the lens frame may correspond to a slim-type optical disc drive.
- an optical disc drive including an object lens configured to face an optical recording medium, a light source configured to emit light toward the object lens, a light-receiving device configured to receive light reflected by the optical recording medium, a base for supporting the lens driving unit, the light source, and the light-receiving device, and a lens driving unit comprising a lens frame comprising four side surfaces and a top surface in which the object lens is disposed, a pair of first driving coils wound around a first side surface of the lens frame, a pair of second driving coils wound around a third side surface of the lens frame, a plurality of suspension wires which are electrically connected to the pair of first driving coils and the pair of second driving coils, a yoke comprising a plurality of magnets fixed thereto which correspond to the pairs of first and second driving coils, and a wire holder to which one side of the yoke and to which the suspension wires are fixed.
- the optical disc drive may further comprise a coil winding unit in which the pair of first driving coils and the pair of second driving coils are wound around the first and third side surfaces.
- the coil winding unit may be integrally formed in the lens frame.
- the pair of first driving coils and the pair of second driving coils may be a tracking coil and a focusing coil, respectively.
- the first and third side surfaces may have relatively large widths in comparison to the second and fourth side surfaces.
- the lens frame may correspond to a slim-type optical disc drive.
- an optical lens driving unit for driving an optical lens in an optical disc drive
- the optical lens driving unit including a lens frame comprising the optical lens on a top surface, a first plurality of winding units on a first outer surface, and a second plurality of windings on a second outer surface, first driving coils wound around the first plurality of windings on the first outer surface of the lens frame, second driving coils wound around the second plurality of windings on the second outer surface of the lens frame, and a holder that comprises a plurality of suspension wires fixed thereto which are electrically connected to the first driving coils and the second driving coils.
- the optical lens driving unit may further comprise a yoke that comprises a first inner surface that faces the first outer surface of the lens frame, a second inner surface that faces the second inner surface of the lens frame, and a connector that fixes the yoke to the holder.
- the first inner surface of the yoke may comprise a first plurality of magnets which face the first driving coils
- the second inner surface of the yoke may comprise second plurality of magnets which face the second driving coils.
- the first driving coils and the first plurality of magnets may perform focusing control of the optical lens, and the second driving coils and the second plurality of magnets may perform tracking control of the optical lens, or vice versa.
- FIG. 1 is a diagram illustrating an example of an optical structure of an optical pickup.
- FIG. 2 is a diagram illustrating an example of the optical pickup of FIG. 1 .
- FIG. 3 is a diagram illustrating an example of an object lens driving unit used in the optical pickup of FIG. 2 .
- FIG. 4 is a diagram illustrating an example of a lens frame supporting an object lens in the object lens driving unit of FIG. 3 .
- FIG. 5 is a diagram illustrating an example of the lens frame of FIG. 4 ;
- FIG. 6 is a diagram illustrating an example of a side view of the lens frame of FIG. 4 .
- FIG. 7 is a diagram illustrating an example of a simulation result (nodal solution) of a lens frame in which coils are arranged in a diagonal symmetric manner.
- FIGS. 8 and 9 are graphs illustrating examples of frequency response characteristics of respective lens frames.
- FIG. 1 illustrates an example of an optical pickup 100 for a slim-type optical disc drive, for example, that may be included in a laptop computer, a notebook computer, and the like.
- the slim-type optical disc drive may be included in a television, a game console, a tablet, a Blu-ray player, a CD/DVD player, and the like.
- the optical pickup 100 includes an optical transmission system 10 , a light source system 20 , and a light-receiving system 30 .
- the optical transmission system 10 directly corresponds to a medium 1 such as a compact disc (CD) or a digital video versatile disc (DVD).
- the light source system 20 may provide a plurality of beams, for example, a main beam positioned in the center of three beams and first to second sub-beams at both sides of the main beam to reproduce/record information from/in the medium 1 .
- the light-receiving system 30 may generate an electrical signal, such as a data signal or a tracking error signal (TES), for processing by a light-receiving device 32 which may have three light-receiving cells receiving three corresponding beams reflected by the medium 1 .
- the light-receiving system 30 may generate the electrical signals to reproduce information and a TES (Tracking Error Signal).
- TES Track Error Signal
- the light source system 20 includes a light source 21 for a CD or a DVD and a diffraction device 22 .
- a beam from the light source 21 is incident on a beam splitter 13 via the diffraction device 22 .
- the diffraction device 22 may generate a main beam and two sub-beams by diffracting a single beam from the light source 21 .
- the light source system 20 may also include a light source and other optics for a Blu-ray disc.
- the light-receiving system 30 includes the light-receiving device 32 that may generate an electrical signal by detecting the three beams reflected by the medium 1 and passing through the beam splitter 13 .
- the light receiving system also includes a sensing lens 31 for collecting the main beam and the first and second sub-beams with an appropriate size with respect to the light-receiving device 32 .
- the optical transmission system 10 includes an object lens 11 corresponding to the medium 1 , path change mirrors 16 and 18 , a quarter wave plate (QWP) 15 , a collimating lens 12 , and the beam splitter 13 .
- the beam splitter 13 may reflect the three beams from the light source system 20 toward the object lens 11 and transmits light reflected by medium 1 so as to be incident on the light-receiving system 30 .
- optical pickup 100 in FIG. 1 includes optics for a CD/DVD, it should be appreciated that the optical pickup 100 may include optics for a Blu-ray, and the like.
- FIG. 2 illustrates an example an example of the optical pickup 100 of FIG. 1 .
- the optical pickup 100 includes a body 101 that may have a predetermined thickness.
- the body 101 may be formed by aluminum die casting or a plastic mold.
- the optical pickup 100 also includes an object lens driving unit 200 which includes a protecting cover 229 that covers an object lens 11 and a peripheral portion of the object lens 11 .
- the object lens driving unit 200 is formed in the body 101 .
- the beam splitter 13 , the light source 21 , and the light-receiving device 32 are inserted and fixed to the body 101 .
- a shaft guiding portion 102 includes a through-hole 102 a into which a guide shaft (not shown) of an optical disc drive is inserted.
- the guide shafting portion 102 may be formed at one side of the body 101 , similar to a structure of a general optical pickup.
- FIG. 3 illustrates an example of the object lens driving unit 200 that is included in the optical pickup 100 shown in FIG. 2 .
- FIG. 4 illustrates an example of a lens frame 210 supporting the object lens 11 in the object lens driving unit 200 .
- FIG. 5 illustrates an example of the lens frame 210 and
- FIG. 6 illustrates an example of a side view of the lens frame 210 .
- the object lens 11 is disposed in the center of a top surface of the lens frame 210 , and a peripheral portion of the object lens 11 is covered by the protecting cover 229 .
- a tetragonal through-hole 211 in which a center yoke 225 a is disposed is formed at both sides of the lens frame 210 in a longitudinal (or tracking) direction (Y-Y).
- the lens frame 210 is electrically connected to a wire holder 220 via a plurality of suspension wires 230 that are fixed at both sides in the longitudinal direction (Y-Y).
- a driving coil structure 212 is fixed to the lens frame 210 .
- the driving coil structure 212 is electrically connected to the suspension wires 230 extending in a lateral direction (X-X).
- each of the plurality of suspension wires 230 is fixed to the wire holder 220 .
- the opposite end of each of the plurality of suspension wires is fixed to the first driving coils 212 a .
- the driving coil structure 212 includes first and second driving coils 212 a and 212 b that are fixed to first and third side surfaces, respectively, of the lens frame 210 in a lateral direction (X-X).
- the suspension wires 230 are electrically connected to the first and second driving coils 212 a and 212 b .
- a yoke structure 225 includes the center yoke 225 a , an outer yoke 225 b , and a connecting unit 225 c .
- the connecting unit 225 c of the yoke structure 225 is fixed to the wire holder 220 .
- the object lens driving unit 200 includes a moving structure and a static structure.
- the moving structure includes the object lens 11 corresponding to a recording medium, the lens frame 210 supporting the object lens 11 , and the driving coil structure 212 for focusing and tracking operations of the object lens 11 .
- the driving coil structure 212 includes a pair of first driving coils 212 a fixed to the first side surface of the lens frame 210 in the minor axis direction (X-X) and a pair of second driving coils 212 b fixed to the third side surface of the lens frame 210 .
- the first driving coils 212 a run parallel to and face the second driving coils 212 b.
- the static structure includes a plurality of permanent magnets 224 a and 224 b , corresponding to the first and second driving coils 212 a and 212 b , the yoke structure 225 , and the wire holder 220 supporting the yoke structure 225 .
- the permanent magnets 224 a and 224 b are fixed to an inner surface of the outer yoke 225 b and face the second driving coil 212 b.
- a pair of first driving coils 212 a and a pair of second driving coils 212 b are respectively disposed on the first side surface and the third side surface of the lens frame 210 , as shown in FIGS. 4 to 6 .
- the pair of first driving coils 212 a disposed on the first side surface may be focusing coils and the pair of second driving coils 212 b disposed on the third side surface may be tracking coils. Therefore, the permanent magnets 224 a and 224 b that face the first driving coils 212 a and the second driving coils 212 b may form a focusing control magnetic field and a tracking control magnetic field.
- the first driving coils 212 a may be tracking coils
- the second driving coils 212 b may be focusing coils
- the permanent magnets 224 a and 224 b that face the first driving coils 212 a and the second driving coils 212 b may form a tracking control magnetic field and a focusing control magnetic field.
- a pair of focusing coils and a pair of tracking coils are diagonally disposed, or a focusing coil (including a tilt) and a tracking coil together are disposed on one side surface.
- a focusing coil including a tilt
- a tracking coil together are disposed on one side surface.
- the first and second driving coils 212 a and 212 b are directly wound around a coil winding unit 216 included in the lens frame 210 , which is different from a conventional lens frame in which a driving coil is manufactured as a separate element and is separately attached to a lens frame.
- the lens frame according to various aspects is different from the conventional lens frame in that driving coils having the same function are attached to one side surface.
- a pair of focusing coils and a pair of tracking coils may be disposed on every side surface.
- FIG. 7 illustrates an example of a simulation result (modal analysis) of a lens frame in which coils are arranged in a diagonal symmetric manner.
- the lens frame may be warped. Furthermore, if the lens frame is formed of plastic, the lens frame may be further significantly warped. In order to solve the above-described problem, the lens frame may be formed of a metal, but in this case, manufacturing costs are increased. It is difficult to remove such a warpage when an external force is applied in such a way that a mode is generated. In other words, when a focusing coil is diagonally and symmetrically disposed, force is applied in a direction of a mode, thereby deteriorating a characteristic of the lens frame.
- a driving coil is disposed in a surface symmetric manner, and thus, warpage of a lens frame does not occur. Although some warpage may occur due to the surface symmetry may occur, the driving coils are formed on both surfaces of the lens frame in a minor axis direction (X-X) of the lens frame preventing additional warpage from occurring.
- FIGS. 8 and 9 are graphs illustrating examples of frequency response characteristics of a lens frame in which coils are arranged in a surface symmetric manner and a conventional lens frame in which coils are arranged in a diagonal symmetric manner, respectively.
- FIG. 8 is a graph illustrating an example of a frequency response characteristic when a focusing coil and a tracking coil are disposed together on a front surface of a lens frame.
- FIG. 9 is a graph illustrating an example of a frequency response characteristic when a focusing coil and a tracking coil are disposed in a diagonal symmetric manner.
- a size (Mag) and a phase (Phs) around a high frequency of 10 Khz.
- a size (Mag) and a phase (Phs) around a high frequency of 10 Khz.
- various aspects herein provide a method of obtaining a good frequency response characteristic and directly winding coils around a winding unit disposed in a lens frame when a focusing coil and a tracking coil are disposed on a front surface of the lens frame.
- the conventional lens frame shows significant variations in a size (resonance size) (Mag) and a phase (Phs) around a high frequency of 10 Khz.
- Magn size
- Phs phase
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110115920A KR101275318B1 (en) | 2011-11-08 | 2011-11-08 | lens actuating unit of optical pickup and disc drive adopting the actuator |
KR10-2011-0115920 | 2011-11-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130114388A1 US20130114388A1 (en) | 2013-05-09 |
US8619520B2 true US8619520B2 (en) | 2013-12-31 |
Family
ID=48223585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/564,780 Active - Reinstated US8619520B2 (en) | 2011-11-08 | 2012-08-02 | Lens driving unit for optical pickup and optical disc drive including the lens driving unit |
Country Status (2)
Country | Link |
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US (1) | US8619520B2 (en) |
KR (1) | KR101275318B1 (en) |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050007906A1 (en) * | 2003-07-07 | 2005-01-13 | Matsushita Electric Industrial Co., Ltd. | Objective lens, optical pick-up device, and optical disk device |
KR20050022263A (en) | 2003-08-28 | 2005-03-07 | 가부시키가이샤 히타치세이사쿠쇼 | An object lens drive unit and an optical pickup |
KR100505673B1 (en) | 2003-02-21 | 2005-08-03 | 삼성전자주식회사 | Optical pickup actuator capable of driving tilt and optical recording and/or reproducing apparatus employing it |
US20050195702A1 (en) * | 2004-03-03 | 2005-09-08 | Goo Hong | Yoke plate for optical pick-up actuator, combination structure of yoke plate with suspension PCB, and optical pick-up actuator including the same |
US20060077780A1 (en) * | 2004-08-27 | 2006-04-13 | Mitsumi Electric Co. Ltd. | Optical pickup unit and optical disc drive having the same |
US20060146661A1 (en) * | 2004-12-31 | 2006-07-06 | Industrial Technology Research Institute | Objective lens actuator |
US20070076540A1 (en) * | 2005-09-23 | 2007-04-05 | Hon Hai Precision Industry Co., Ltd. | Objective lens actuator |
US20080159090A1 (en) * | 2006-12-28 | 2008-07-03 | Kabushiki Kaisha Toshiba | Optical pickup and disk drive device |
US20080239929A1 (en) * | 2007-03-30 | 2008-10-02 | Nidec Sankyo Corporation | Optical head device |
KR20090010511A (en) | 2007-07-23 | 2009-01-30 | 엘지전자 주식회사 | Actuator for optical pickup |
US20090116129A1 (en) * | 2007-11-07 | 2009-05-07 | Manabu Ochi | Objective Lens Actuator and a Disc Apparatus Using the Same Therein |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100505648B1 (en) * | 2002-11-14 | 2005-08-03 | 삼성전자주식회사 | Magnetic circuit and actuator for optical pickup and optical recording and/or reproducing apparatus employing it |
-
2011
- 2011-11-08 KR KR1020110115920A patent/KR101275318B1/en not_active IP Right Cessation
-
2012
- 2012-08-02 US US13/564,780 patent/US8619520B2/en active Active - Reinstated
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100505673B1 (en) | 2003-02-21 | 2005-08-03 | 삼성전자주식회사 | Optical pickup actuator capable of driving tilt and optical recording and/or reproducing apparatus employing it |
US20050007906A1 (en) * | 2003-07-07 | 2005-01-13 | Matsushita Electric Industrial Co., Ltd. | Objective lens, optical pick-up device, and optical disk device |
KR20050022263A (en) | 2003-08-28 | 2005-03-07 | 가부시키가이샤 히타치세이사쿠쇼 | An object lens drive unit and an optical pickup |
US20050195702A1 (en) * | 2004-03-03 | 2005-09-08 | Goo Hong | Yoke plate for optical pick-up actuator, combination structure of yoke plate with suspension PCB, and optical pick-up actuator including the same |
US20060077780A1 (en) * | 2004-08-27 | 2006-04-13 | Mitsumi Electric Co. Ltd. | Optical pickup unit and optical disc drive having the same |
US20060146661A1 (en) * | 2004-12-31 | 2006-07-06 | Industrial Technology Research Institute | Objective lens actuator |
US20070076540A1 (en) * | 2005-09-23 | 2007-04-05 | Hon Hai Precision Industry Co., Ltd. | Objective lens actuator |
US7606119B2 (en) * | 2005-09-23 | 2009-10-20 | Hon Hai Precision Industry Co., Ltd. | Objective lens actuator |
US20080159090A1 (en) * | 2006-12-28 | 2008-07-03 | Kabushiki Kaisha Toshiba | Optical pickup and disk drive device |
US20080239929A1 (en) * | 2007-03-30 | 2008-10-02 | Nidec Sankyo Corporation | Optical head device |
KR20090010511A (en) | 2007-07-23 | 2009-01-30 | 엘지전자 주식회사 | Actuator for optical pickup |
US20090116129A1 (en) * | 2007-11-07 | 2009-05-07 | Manabu Ochi | Objective Lens Actuator and a Disc Apparatus Using the Same Therein |
Also Published As
Publication number | Publication date |
---|---|
KR101275318B1 (en) | 2013-06-17 |
US20130114388A1 (en) | 2013-05-09 |
KR20130050708A (en) | 2013-05-16 |
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